Improvement in machines for bending and twisting metal bars



2 Shee ts Sheet I.

S. HOLMES. Machines'fnr Bending and Twisting Metal Bars.

NO. 142018, Patented Augustl9,l8 73 Q MMM AM Hmm-urnosRAPmc ca NX (Usauflils PROCESS.)

2 Sheets-V-Sheet 2 S. HOLMES. Machines for Bending and Twisting Metal Bars.

Patented August 19, 1873.

yw z um AM PnomumasnAP/ns ca N. x(oss afiNEls PRHCIESS) UNITED STATES I SAMUEL HOLMES, OF PHILADELPHIA, PENNSYLVANIA.

Specification forming part of Letters Patent No. 142,0! 8, dated August 19, 1873; October 24, 1872.

I Be it known that I, SAMUEL HoLMEs, of La Pierre House, Philadelphia, Pennsylvania, have invented certain Improvements in Machines for Bending and Twisting the Longitudinal Frames used in Iron-Ship Building, of which the following is a specification:

The machine herein described is a tool for setting and twisting all sections of iron appropriate for framing ships on the longitudinal system; also, for bending and twisting angleiron, beam-iron, channel-iron, H-iron, and any section of iron used in ship-building, bridgebuilding, and general engineering.

The invention may be described briefly to consist of two arms suspended at the upper end in sockets, so as to be capable of a swinging movement similar to that of a pendulum.

' In-the center of the top joints is cut a groove or notch of a suitable shape to accommodate the form of the angle or T iron to be twisted. The iron is inserted in these grooves and one arm held fast, while the other is moved by 7 power, giving the iron the'requisite twist,

which is indicated bya pointer attached to the framing. There is also an arrangement upon the same machine for bending the angle or T-iron. This I accomplish by two sliding blocks, adjustable upon the same table or casting to which the aforesaid arms are hinged, and which receive the thrust of an eccentric upon a central shaft, which also carries an additional eccentric for operating the twistingarms. 7

Referring to the drawings making part of -this specification, Figure 1 is a longitudinal section through the machine on line X Y. Fig. 2 is a similar section on a different line, VW. Fig. 3 is a plan. Fig. 4 is a crosssection on line T U. Fig. 5 is a plan of the upper eccentric thrusting-block. Fig. 6 is a plan of the lower-eccentric thrusting block Fig. 7 is a vertical section through the two thrusting-blocks.

In Figs. 3 and 5 is shown the squeezer A, sliding in guides or a box, a upon the table D. It is operated by an eccentric, B,fixed upon the main vertical shaft 0. A sliding wedge, a, is fitted into the squeezer, so that when withdrawn the squeezer is thrown out of gear. E E are two cast-iron blocks, sliding IMPROVEMENT IN IiilACl-HNES FOR BENDING AND TWlSTINGMEQTAL BARS.

application filed in guides sunk in the face of the table D. Below the table are two screws, F, which enter the nuts 0 attached to the blocks E. These screws project beyond the end of the table, and have cog-wheels e keyed on. These are geared together by the intermediatepinion g, sothat by turning the handle 9 the blocks E E advance or recede to the proper line for a specified curve. w The T or angle iron is placed across the table between the blocks E and the squeezer A, which latter, being set in motion, bends the iron to the curve desired. The bar is then moved endwise and another squeeze given it.

In the forming of longitudinal frames for ship-building it is requisite that they be twisted, as well as bent and this part of the tool I will now describe. table are bolted the four triangular frames H, which are formed into bored. socket-joints h inclosing the disks k and 70 which form part of the upper end of the pendent arms K L, the lower end of the arms being capable of a swinging motion, like a pendulum. In the center of the disk is cut a notch, at, suitable for holding the kind of iron to be twisted; also, various shaped notches may be made in movable plates, which are fitted into the said disks. The sockets hl only extend a certain distance on each side of the disk, so as to leave the top exposed for readily inserting the angle-iron. To one of the arms, K-that farthest to the right, in Fig. 4--is secured a 1ink,N. The other end of the link is jointed to a swivel and operated by the screw 0. By turning the screw 0 the arm is moved as much from the perpendicular as may be required to put the twist upon it, the exact angle being indicated by the pointer p fixed to the side of the socket. A spring bar, 70 is bolted to the lower end of the right-hand arm 70, and it presses against the other arm, L, so that the arms both move in unison into position previous to the thrust being put on. The arm L can, if necessary, be adjusted to its position corresponding to that of arm K by means of the pinion It upon the shaft r which gears into the rack r upon the end of the arm. S is an eccentric keyed upon the main shaft 0. It slides within an elongated strap, 8 which, acting as a thrustingblock, is pre To the top of the vented from turning round by the pins 8 which fit into the grooves 8 On the end of the strap is aT-shaped hinge, s*,whioh communicates the thrust of the cam to the arm L. It is so constructed that it will not fall, and yet have a small vertical motion to accommodate itself to the angle of the arm. A cutting-blade, t, is also fixed upon the framing D, and another similar blade on squeezer A, by means of which the bar can be sheared the proper length.

The operation of twisting is in this way: The frame to be twisted is inserted in the notches an out in the disk 70 I0 and secured tight by wedges. The arm K is then put over to the required angle of twist by means of the screw 0, the angle being indicated by the pointer 19 and a scale upon the disk 70 The arm K is accompanied in its motion by the arm L. to the same angle by means of the spring 70 The arm L can also be adjusted into line with more accuracy by the pinion and rack It r. The shaftO being then put into operation the eccentric thrust comes upon the end of the arm L, which is immediately brought to the perpendicular, the disk K remaining at the angle at which it was previously set. The required twist is given the bar over the space between the disks, which, being repeated at the several stations in the length of the bar, it is rapidly twisted over its entire length. After the bar is bent and twisted it can be out to its exact length by the an gle-cutters t 23 worked by the squeezer.

I do not confine myself to the exact mode herein shown of working the thrusting-block, as a horizontal shaft, geared into the upright shaft 0, and having a simpleeccentric or cam only, would put the requisite thrust upon the arm.

A modified form of this twisting device may be worked by hand if one arm, K, be fixed stationary. The bar to be twisted is inserted in the notches, and the arm L forced by a hand-screw to the proper angle necessary to give the twist.

What I claim is-- 1. The two arms KL, both working in sock ets 7L with a suitable clamping device, an, or with one arm only'working in a socket and the other fixed,the two arms being so arranged in relation to each other that one is capable of a motion independent of the other for the purpose of twisting an iron bar, as herein described.

2. The notches m, arranged centrally within the disks k k for clamping the bar to be twisted, as herein described.

3. The combination of the socketed arms K L, the adjusting-link N, and the thrustingblock 3 operating as herein described.

4. The combination of the arms K L and the spring-bar K operating as and for the purpose herein set forth.

5. The combination of the pinion R, the rack r arranged to adjust the arm L, as herein described.

6. The combination of the adjustable blocks E E, the screws F F acting in unison, and the squeezer A, operating as herein described.

7. The .arrangement of the shaft 0, the thrusting-block s and arm L, in combination with the squeezer A and adjustable blocks E E, so that the said shaft operates both the bending and twisting mechanisms.

SAMUEL HOLMES.

WVitnesses:

Enwn. BROWN, J oHN F. GRANT. 

